retinal UK /ˈɹɛt.ɪn.əl/US /ˈɹɛt.ən.əl/adjective 1/ˈɹɛt.əˌnæl/ noun 1forms 1 adjective1 •Of or pertaining to the retina. retinal /ˈɹɛt.əˌnæl/ noun1 •A yellow to orange aldehyde derived from vitamin A that is formed from rhodopsin by the action of light and in combination with proteins forms the visual pigments of the retinal rods and cones. formsretinals
